I'll try to collect a few FAQ here. You can also ask questions here in the replies.

What's the deal with multiplayer?

For the moment it's only available to supporters on Ko-Fi or Patreon. There are a lot of things to iron out with multiplayer. So don't expect everything to work flawlessly. There is also a slightly cumbersome process to join a multiplayer session the first time. That's also a reason why the access is limited right now. I hope that when multiplayer works a bit better, I can put it on Epic Games Store and then it should work as every other game.

Can i use the Keyboard to move the Booster and Ship? 

Yes. Just read the hint in the main settings tab of the control panel which shows up by default right after you loaded in ;)

Wen Mac version?

As soon as I get a Mac, because with Unreal Engine you need a Mac yourself to make a build, which was not necessary with Unity. I can't buy one right now though, so unless I get one gifted, it won't happen anytime soon.

But can't you still play it on Mac in a virtual machine?

Probably, but I don't know much about Macs. So if anyone could help us out here with a guide, you are very welcome! If it's possible.

Wen save game feature?

It doesn't have high priority right now, but is on the list. Maybe I'll even make a Ko-Fi goal for it.

Wen booster bidet a.k.a. pancake a.k.a. steel plate a.k.a. water deluge system a.k.a. upside down shower head a.k.a. what other name did I miss?

It's on the list with features to be added. The list is roughly sorted by priority. Check the main page

Why is feature X not on the future features list?

Firstly, the list hasn't been updated in a while, but will be soon™. Secondly, I might not have thought (much) about it yet. In this case, thx for the suggestion! :)

Wen mobile version?

Right after the console version is done.

Wen console version?

No idea. Maybe when I have loads of money or I am bored and everything else is done. Currently it's not something I'm very interested in.

Wen next update?

I try to finish an update every 1 to 2 months. But sometimes it takes longer.